Slidable vane pump



Pefented Feb. 22, 1949 2,462,732 n sLmABLE vANE PUMP Julius' Dusevolr, Dearborn,

Mich., assignor to godlsolldated Vultee Aircraft Corp., San Diego,

Application October 12, 1945, Serial No. 821,869 8 Claims. (Cl. 103-138) This invention relates to rotary pumps andmore particularly to the type in which a vane is slidably mounted in the rotor and engages a cylinder for the rotor.

One object of thevinvention is to provide a duplex oil pump of this type which is simple in construction and includes rotor for pressure and scavenging units rotating together and mounted on a single shaft. K

Another object of the invention is to provide a pressure pump of this type which is provided with a relief valve in one end of the pump-casing which co-acts with the discharge duct in one end of one of the pistons of the rotor.

Another object of the invention is to provide a rotary vane `type pump which is extremely simple and compact in construction and is adapted for small umts.

Other objects of the invention will appear from the detailed description.

The invention consists in the several features hereinafter set forth and more particularly deined by claims at the conclusion hereof.

In the drawings:

Fig. 1 is a side elevation of a Pump embodying the invention, the casing being shown in section.

Fig. 2 is a longitudinal section taken on line 2-.2 of Fig. 1.

Fig. 3 is a transverse section taken on line 3-3 of Fig. 1.

Fig. 4 is a transverse section taken on line I-l 0f Fig. 1.

Fig. 5 is a transverse section of Fig. 1.

The invention is exemplied in a, construction which comprises a, casing I which is provided with a cylinder I I formed in a bushing I2 which is adjacentone end of the casing for a. rotary piston for delivering fluid under controlled pressure from the casing; a cylinder I4 for a second rotary piston adjacent the other end of the casing and longitudinally aligned with and of the same ditaken online 5 ameter as cylinder II of a scavenging unit; and an eccentric bearing I5 between said cylinders.

inder I4. `A pipe I9 is communicatively connected to the chamber in head i8 for delivering fluid under pressure from cylinder II to the place of use.

The rotor comprises a shaft 2n which is journalled in a bushing 2I in an extension or sleeve 22 on one end of the casing, a rotary cylindrical piston 28 operating in cylinder I I, and a cylindrical piston 29 operating in cylinder I4, the shaft and plstonslbeing integrally formed and insertable into the casing through the end thereof which is closed by head I8. Shaft 20 projects from the casing and is driven by power from any suitable source through a gear 25 which is secured on a splined portion 26 of said shaft outside of sleeve 22. An annular'iiange 24 is integrally formed with sleeve 22. An oil seal 23 is confined in sleeve 22 around shaft 20. Pistons 28, 29 are provided with cylindrical peripheries which are concentric with the axis of shaft 20 and eccentric to cylinders I I, I4 for bodily rotation in and tangentially engaging the cylinders, respectively. Pistons 28, 29 are of the same diameter and diametrically oppositely disposed on shaft '20. The

rotor, between cylinders II, I4,l is provided with an annular groove 32 in which is conned a splittype bearing-ring 3| which ts in the eccentric bearing I5 and is h'eld in said groove-by a retaining spring 33. Piston 29 and ring 3| are of the `same diameter as the eccentric bearing I5 in the casing to permit them to be assembled with the casing by insertion of the shaft cylinders Il, I4 and bearings I5 and passing piston 29 into cylinder I4 through eccentric bearing I5 from the end of the casing which is closed by head I8. Ring 3| is split so it can be assembled with the pistons before the rotor is assembled with the casing and is of the same diameter as bearing I5. This construction makes it possible to provide a rotor including an integral shaft and pistons with an intermediate bearing-ring which can be 'readily inserted and removed from the casing. The pistons are of the same diameter and integrally formed with the shaft 20, for economic fabrication. A longitudinally and radially extending channel 35 and a communicating central port 36 are formed in piston 28 and extend to the end of said piston which is disposed adjacent the head I8. A vane 31 lits and is radially slidable in channel 35 and its outer edge is pressed into engagement with cylinder I I by a spring 38. Vane 31 is provided on its discharge side with lands 4I between which fluid is forced from the cylinder into channel 35 and port 36 from which it is discharged under pressure. As piston 28 is rotated,

one side of its periphery will slidably engage the one of the pump cylinders at a predetermined pressure, for example, for lubricating'parts. For this purpose a plate or disk 43 slidably ts in the chamber in head I8 and against the discharge side of piston 28 and is provided with a central port 44 communicating with and in' oset relation to the end of port 36 in said piston through which oil is discharged from cylinder I I. A spring 45 is interposed between disk 43 and head I8 and normally holds said disk against the outer end face of piston 28. While the pressure of oil from cylinder II is normal, disk 43 will permitY the oil to pass therethrough for discharge to the lubricating system. When the pressure becomes excessive or greater than the predetermined pressure desired, the increase in the port 36 will force the disk away from the piston and permit some of the oil to flow or by-pass between disk 43 and the end of the piston to channel 35 and thus-reduce the ow of the oil through the disk to the `special ports in the casing, or any enlargement thereof for attaining pressure control. By substituting springs of different magnitudes for the spring 45, the maximum pressure of the discharged oil may be readily varied.

The piston, 29.01? the scavening unit is provided with a longitudinally extending radial channel 46 which communicates with a central port 41 which extends through shaft 20 to provide a discharge outlet for oil from cylinder I4. A vane 48 is radially slidable in channel 46 and its outer end is pressed into contact with cylinder I4 by a spring Y49. Vane 48 is provided with lands 5I on its pressure side for forcing the uidincylinder I4 in advance of vane 48 between lands 5I and .into channel 46 and port 41.

yWhen the rotor is driven, the rotating piston 28 and the vane carried thereby will draw oil into cylinder II through inlet I3 which will be discharged under pressurev from the piston through port 36 at one end of said piston. The pressure responsive disk 43 will control the4 pressure to a predetermined maximum and by-pass any excess oil between said disk and the end of piston 28 into channel 35, while Vthe oil is discharged from one end of the casing. The rotatable piston 29 will draw uid through inlet I3a into cylinder I4 and discharge oil through' the central port 41 which extends through shaft 2li, so that the oil will be discharged from the opposite end of the casing.

The invention exemplifies a rotary pump of the slidable vane-type which includes a piston for discharging oil under regulated pressure and a piston for oil scavenging. The discharge from the cylinders is through opposite ends of the rotor which includes a drive shaft 20 at one end and the discharge of the fluid from the pressure regulated unit is through the casing at its opposite end. The pressure regulating device is in the casing at the end of the piston and is simple 'in construction and elcient in operation. The pump in its entirety is simple in construction.

e 4 formed oi' few parts, and may be made in small sizes.

The'invention is not to be understood as lim-v ited to the details described, since these may be modified within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus ldescribed the invention, what-I claim as new and desire to secure by Letters Patent is:

1. A` rotary pump comprising: a casing provided with a pair of co-axial cylinders, an integral eccentric bearing between the cylinders, inlet ducts extending through the' walls of and communicating with the peripheries of the cylinders, respectively; an integral wall andan ec- -centric bearing at one end oi' the casing, and a nels communicating with the central ducts, ren spectively; and vanes .slidably mounted in the` channels, engaging the cylinders and provided with ducts therein for discharging uid under pressure from the cylinders to said central ducts, respectively, the head being provided with an outlet for the discharge of fluid from the central duct in the adjacent piston.

2. A rotary pump comprising: a casing provided with a pair of co-axial cylinders, an integral eccentric bearing between the cylinders, inlet ducts extending through the walls of and communicating with the peripheries of the cylinders, respectively; an integral wall and an eccentric bearing at one end of the casing, and a removable head in the opposite' end of the casing; a rotorincluding a shaft journalled in. the eccentric end bearing; a pair of vco-axial cylindrical pistons on the shaft tangentially engaging the cylinders, respectively; a sectional bearing-member on the rotor between the pistons and. tting in the eccentric bearing between the cylinders; said pistons, bearing member and the shaft. being insertable through the end of the cylinder provided withv the removable head; the pistons being provided with separate central longitudinal discharge ducts therein extending to the opposite ends of the rotor, respectively, and radial channels communieating with the central ducts, respectively; and vanes slidably mounted in the channels, engaging the cylinders and provided with ducts in one of the side-faces for discharging iluid under pressure from the cylinders into the discharge ducts, respectively, the head being provided with an outlet forv the discharge of uid from the central duct in the adjacent piston 3. A rotary Ypump comprising: a casing provided with a. pair of co-axial cylinders, an integral eccentric bearing between the cylinders, inlet ducts for the cylinders, respectively; an integral wall and an eccentric bearing at one end of the casing,

and a removable head in the opposite end of the casing; a rotor including a shaft journalled in the eccentric end bearing; a pair of co.axial cylindrical pistons on and integral with 4the l shaft tangentially engaging the cylinders, respectively; a sectional bearing-member on the rotor between the pistons and tting in the eccentric bearing between the cylinders; said pistons, bearingmember and the shaft being insertable through the end of the cylinder provided with the removable head; the pistons being provided with separate central longitudinal discharge ducts therein extending to the opposite ends of the rotor, respectively, and radial channels communicating with the central ducts, respectively; and vanes slidably mounted in the channels, engaging the cylinders and provided with ducts therein for discharging fluid under pressure fromthe cylinders to said central ducts, respectively, the head being provided with an outlet for the discharge of fluid from the central duct in the adjacent piston.

4. A rotary pump comprising: a casing provided with a cylinder and an integral wall at one end thereof and a removable head at its opposite end and provided with an inlet for fluid to the cylinder; a rotor including a shaft eccentrically journalled in the end of the casing having the integral wall and a cylindrical piston co-axial with the shaft, eccentrically disposed in and tangentially engaging the cylinder, and provided with an endface adjacent the head and with a central duct and a radial channel communicating with said duct, said duct and channel being extended to said end-face of the piston; a radial-vane slidably mounted in the channel engaging the cylinder and having ducts therein for discharging uid under pressure from the cylinder to the central duct; a plate tting against one end of the piston, provided with a port communicating with the central duct, and responsive to pressure in said duct; and spring-means for pressing the plate against the end face of the piston, the plate being movable by oil pressure for by-passing oil from the central duct to the channel, the head being provided with an outlet for the discharge of uid from the central duct in the adjacent piston.

5. A rotary pump comprising: a casing provided with a cylinder and an integral wall at one end thereof and a removable head at its opposite end and provided with an inlet for fluid to the cylinder; a rotor including a shaft eccentrically journalled in the end of the casing having the integral wall and .a cylindrical piston co-axial with the shaft, eccentrically disposed in and tangentially engaging the cylinderrand provided with an end-face adjacent the end of the casing which is closed by the head and with a central duct and a radial channel communicating with said duct, said duct and channel being extended to communicate with said end-face of the piston; a radial vane slidably mounted in the channel engaging the cylinder and having ducts therein for discharging fluid under pressure from the cylinder to the central duct; a plate fitting against one end of the piston, provided with a port communicating with the central duct and responsive to pressure in said duct; and a removable spring in the head for pressing the plate against the end-face of the piston, the plate being movable by oil pressure for by-passing oil from the central duct to the channel, the head being provided with an outlet for the discharge of iiuid from the central duct in the adjacent piston.

6. A rotary pump'comprising: a casing provided with a pair of co-axial cylinders and inlet ducts extending through the walls of and communicating with the peripheries of the cylinders,.respec tively; a rotor including a shaft eccentrically journalled in the casing and a pair of integral cylindrical coaxial pistons eccentrically disposed in and tangentially engaging the cylinders and having separate central discharge ducts extending to the ends of the rotor, respectively; vanes .mounted for radial sliding movement in the pistons, having their outer ends engaging the cylinders, respectively, and provided with ducts for discharging uid under pressure from the cylinders to the central longitudinal discharge ducts, respectively, the casing being provided with an outlet for the discharge of fluid from the central duct in one of the pistons. n

7. A rotory pump comprising: a casing provided with a pair of co-axial cylinders and inlet ducts extending through the walls of and communicating with the peripheries of the cylinders, respectively; a rotor including a shaft eccentrically journalled in thecasing and a pair of integral cylindrical coaxial pistons eccentrically disposed -in and tangentially engaging the cylindersy and having separate central discharge ducts extending to the ends of the rotor, respectively; vanes mounted for radial sliding movement in the pistons, having their outer ends engaging the cylinders, respectively, and provided with open sided grooves in one of their side faces, for discharging iluid under pressure from thecylinders to the central longitudinal discharge ducts, respectively,

the casing being provided with an outlet for the discharge of fluid from the central duct in one of the pistons.

8. A rotary pump comprising: casing provided with a pair of co-axial cylinders of the same diameter and inlet ducts extending through the walls of and communicating with the peripheries of the cylinders, respectively; a rotor including a shaft eccentrically journalled in the casing and a pair of integral cylindrical coaxial pistons eccentrically disposed in and tangentially engaging the cylinders and having separate central discharge ducts extending to the ends of the rotor, respectively; a bearing including arcuate sections, for the rotor and disposed in the casing and between the pistons; vanes mounted for radial sliding movement in the pistons, having their outer ends engaging the cylinders, respectively, and provided with ducts vfor discharging fluid under pressure from Vthe cylinder to the central longitudinal discharge ducts, respectively, the casing being provided -with an outlet for the discharge of iiuid from the central duct in one of the pistons.

JULIUS DUSEVQIR.

REFERENCES CITED -The following references are of record in the.

le of this patent:

UNITED STATES PATENTS Number Name Date 1,743,585 Wiltse Jan. 14, 1930 1,807,392 Davis May 26, 1931 1,988,213 Ott Jan. 15, 1935 2,065,008 Madle Dec. 22, 1936 2,306,276 Nash Dec. 22, 1942 2,394,185 Jaworowski et al. Feb. 5, 1946 

